Best Dither Type For Printing Photos?

Are you intending to print signs or decorative art?

 

I've never noticed a difference in output whether I used Stochastic or Adaptive Error Diffusion, so I just stick with Adaptive Error Diffusion (Using Caldera).

I generally get better results switching rendering intent from Relative Colorimetric to Perceptual when gradients aren't printing well. Quality is more related to profiling/print mode/passes/inks/etc than dithering type.

 

Print bitmaps with a rendering intent of 'Perceptual', print everything else with 'No Color Correction'. Pick the highest dither algorithm your software supports. The better the dither, the better the output.